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INVESTMENT SECURITIES - Amortized cost and estimated fair value of available-for-sale securities excluding SBIC (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 59,100 $ 45,723
Fair Value 58,903 43,695
Debt available for sale securities pledged as collateral $ 5,500 $ 5,400
Threshold Percentage Of Shareholders Equity Amount Held As Securities By One Issuer 10.00% 10.00%
Unrealized loss $ 409 $ 2,039
Number of securities in continuous unrealized loss position for more than twelve months | security 3  
Available for sale securities, excluding SBIC    
Debt Securities, Available-for-sale [Line Items]    
Due after one year through five years amortized cost $ 250  
Due after one year through five years fair value 254  
Mortgage-related securities, amortized cost 58,850  
Mortgage-related securities, fair value 58,649  
Amortized Cost 59,100  
Fair Value $ 58,903  
Number of securities in unrealized loss position | security 26 33